The Spicer 18 has a variety of low-range gearing options, but the most common is a 2.43 or 2.46:1. This isn’t bad, but we opted to downshift even further with the Teraflex 3.15:1 gearset. This, combined with the 6.55 First of the SM465, and our planned axle ratio of 5.38 gives us a crawl ratio of 111:1, perfect even with our planned four-cylinder engine (more on the engine in a later issue).